Direct power control of shunt active filter using high selectivity filter (HSF) under distorted or unbalanced conditions

• Extraction of power references components of shunt active power filter.
• New formulation of direct power control DPC based on high selectivity filter HSF are proposed and detailed.
• Comparison between conventional DPC and proposed DPC with IEEE-519 power definitions.
• Performances are evaluated under distorted or unbalanced conditions.
• Proposed DPC with HSF has a good performance in the harmonic compensation under non-ideal conditions.

This paper describes the design of a new configuration of direct power control (DPC) based on high selectivity filters (HSF) to achieve near-sinusoidal source current waveforms under different source voltage conditions. The proposed method uses the high selectivity filters instead of the classical extraction filters (low pass filters). The basic idea of the proposed DPC is to choose the best inverter voltage vector in order to minimize instantaneous active and reactive power errors using two hysteresis comparators. Their outputs associated with a switching table, control the active and reactive powers by selecting the optimal switching states of the inverter. Simulation results have proved excellent performance, and verify the validity of the proposed DPC scheme, which is much better than conventional DPC using low pass filters.